Aerial propeller.



F. R. GOLDER.

I AERIAL PROPELLER. APPLICATION FILEDZSEPTJI, 1915.

1 1 90, 1 49. Patented July 4, 1916.

Slmozwtoz fleaC/Z. ala/ e)" I reference belng FRED It. comma, orcHIcAGo, ILLINOIS.

AERIAL PROPELLEB.

Specification of LettersPatent.

Patented July 4., 1916.

Application filed September 11', 1915. I Serial No. 50,245.

To all whom it may concern:

Be it known that I, FRED R. GOLDER, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented new and useful Improvements in Aerial Propellers, of which thefollowing is a specification.

My invention relates to aerial propellers, and is designed to provide anovel, eflicient and reliable type of propeller for flying machines,dirigible balloons, aerohydropla-nes, flying bodies, and similar craftemploying propellers to act upon the air. v

The primary object of the invention is to provide a propeller which willact upon a column of condensed and concentrated air, whereby greaterthrust pressure and proelling efliciency is obtained.

A further object of the invention is to pro? vide an aerial propellerembodying an inclosed propeller proper of the spiral bladed type,together with means for forcing a confined column of air under pressureagainst the propeller, by which a reaction is obtained against acondensed body of air to secure a greater driving or lifting impulse,while reducing slippage to the minimum.

The invention consists of the features of construction, combination andarrangement of parts herein had to the accompanying drawing in whichFigure 1 is a side elevation of an aerial propeller embodying myinvention. Fig. 2 is a vertical longitudinal section of the-same. Fig. 3is a vertical transverse section on line 33 of Fig. 1. Fig. 4 is avertical transverse section on line 4-4 of Fig. 1. Fig. 5 is a 'viewsimilar, to Fig. 2 disclosing the slightly modified structure.

In carrying my invention into ractice, I provide a casing 1, preferablycyhndrical in form, and within which is arranged a rotary fan or blower2, the blades of which are mounted upon a longitudinally extendin shaft3. The forward portion of this sha is provided with a pulley 4: or othermeans for the transmission of power to the drive fan or blower from asuitable power plant.

Communicating with the rear side of the casing 1 is. a cylinder or airtunnel 5, which is open at both ends, and communicates at its forwardend with the interior of the casing, so that the air drawn into thecasing and compressed by the action of the fan will be forced rearwardlyin the form of a confully described and claimed, 3

densed column ofair through the cylinder 5, and discharged into theatmosphere at the rear end thereof. a 5

p Extending longitudinally through the casing is a shaft 6, which iscoupled to the shaft 3 in any suitable manner, as shown at 7. This shaft6, as illustrated in Figs. 1 to 4, inclusive, is journaled torotatewithin bearings 8 in the cylinder and receives driving motion fromthe shaft 3, the casing and cylinder being held stationary or fixedagainst motion when applied for use. The shaft 6 carries a plurality ofspiral vanes or blades 9, which will act upon the column of air forcedthrough the cylinder 5, whereby the air is condensed to a greater degreeand the blades caused to work with a screw-like motion against a bank ofhighly compressed air, sov that a maximum thrust action is obtained.

It will of course be understood that the propeller may be employedeither as a driving propeller or lifting propeller, and is arrangedhorizontally or vertically according to its intended purpose in theseparticulars. Its principal advantage in operation is, that the spiralpropeller blades act upon a column of air initially compressed and heldconfined, and further compressed by the'spiral blades, by which theblades are caused to act upon a localized area of air of great densityand to that much greater efficiency is secured than can be obtained bythe action of a propeller upon free air. It will of course be under;stood that the helical or spiral vanes or blades may be of anypredetermined radius and pitch according to the size of'blower and poweravailable, and that in the operation of the propeller the air isdischarged velocity in the path of a true with great whereby anadditravel upon a spiral thread of banked alr, so

the cylinder to revolve therewith. Both structures, and othersequivalent thereto, are held to fall within the spirit and scope of myinvention.

An aerial propeller ,comprising a blower casing, a cylinder oflessdiameter than said casing and communicating at one end therewith, ashaft within the blower casing, angularly disposed blades secured tosaid shaft and forming a rotary blower of the same diameter as thecasing and operating therein, a longitudinal shaft extending through thecylinder and connected with the first-named shaft, and spiral bladeswithin the cylinder 10 and connected with said longitudinal shaft,

said blades forming a spiral propeller of a diameter conforming to theinterior of the cylinder.

In testimony whereof I aflix my signature in presence of two witnesses.

FRED R. GOLDER.

Witnesses:

SoRnN MATHrsoN, CHAS. F. BUSHONG.

